when shut down a Kestrel kernel notebook, no matter using the shut down button, or terminate jupyter, this error occurs:
Traceback (most recent call last):
File "/venv/kestrel/lib64/python3.9/site-packages/ipykernel/kernelbase.py", line 328, in process_control
await result
File "/venv/kestrel/lib64/python3.9/site-packages/ipykernel/kernelbase.py", line 911, in shutdown_request
await self._at_shutdown()
TypeError: object NoneType can't be used in 'await' expression
when shut down a Kestrel kernel notebook, no matter using the shut down button, or terminate jupyter, this error occurs: